Relationship between spatial coherence of synchrotron radiation and emittance

Y. Takayama, Tadashi Hatano, T. Miyahara, W. Okamoto

    Research output: Contribution to journalArticlepeer-review

    19 Citations (Scopus)


    Analytical calculation of the first-order spatial coherence for the Gaussian beam and the exact numerical calculation for synchrotron radiation are compared in this paper. The approximation of regarding synchrotron radiation as a Gaussian beam is often used to investigate the brightness, the flux and some qualitative properties. Calculations show that synchrotron radiation does not have as high coherence as the Gaussian beam because of the beam profile, the phases of the wave and the polarization. If one can measure the beam size and the spatial coherence of synchrotron radiation, it is possible to determine the total photon beam emittance without any knowledge of the Twiss parameters of the ring.

    Original languageEnglish
    Pages (from-to)1187-1194
    Number of pages8
    JournalJournal of Synchrotron Radiation
    Issue number4
    Publication statusPublished - 1998 Jul 1


    • Coherence
    • Emittance
    • Gaussian beam
    • Visibility

    ASJC Scopus subject areas

    • Radiation
    • Nuclear and High Energy Physics
    • Instrumentation


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